I remember seeing a most fantastic piece of wall art that incorporated a wind-up clock spring, and gears, that would slowly turn and reposition figurative pieces of wood against the wall. The end result was an everchanging work of art! And when it “wound down”, one would only have to “wind it up” again. No electricity; no batteries.
I remember that these pieces also went for thousands of dollars as well!

No, but it’s close. What I saw was “wind-up”, or it ran off of weighted chains (Grandfather clock style). The whole piece moved, very slowly. The cost of this “artwork” was in the thousands too. Also used a variety of exotic woods and colors to acheive the effects. They very beautiful to see. Yes…There were many versions.